and tomorrow will be a day of mourning across connecticut. at 9:30 a.m. tomorrow, a moment of silence to mark the one-week anniversary of the tragedy. >>> and also today, vice president joe biden began his task of curbing gun violence in america. he called in cabinet officials, police chiefs and law enforcement experts to give him ideas. and one of those men was the chief of police in baltimore, maryland, jim johnson, who said it's time to stop letting anyone who wants to fire off dozens of bullets without even having to reload. and he shows abc's john quinones the mere seconds that could save lives. >> reporter: they come in cases of 20, 30, even 120 bullets. maximum fire power packed into high capacity magazines. >> a lot more fire power. >> reporter: when the magazine is loaded into a weapon, a shooter can keep firing until it's empty. by then, the damage can be devastating. and this is why the police chief in baltimore county, maryland, wants to outlaw all but the smallest of these magazines. right here, this is it? >> yes, sir. >> reporter: the fewer